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Anonymous
84 is 20% of 420. If you take 84 off of 420, you get 336. You could also look at it in another way, if you regard 20% as 0.2, then 420 - 0.2 is 419.8.
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30% off $420 = $420 - (0.3 x $420) = 294
420 - 84 = 336
700-280=420
Sale price is $252.00
40% of 420 is 168.